Note: We might also have expressed the critical value as a z score. Because the sample size is fairly large, a z score analysis produces a similar result-a critical value equal to 2.58. 1  Compute margin of error (ME): ME = critical value * standard error = 2.61 * 0.82 = 2.1. 2  Specify the confidence interval.3  margin of error.he Variability of the Sample Mean. To construct a confidence interval for a sample mean, we need to know the variability of the sample mean. This means we need to know how to compute the standard deviation or the standard error of the sampling distribution.
Search form. 401(k) and IRA Required Minimum Distribution Calculator. Per IRS regulations, after reaching age 70Â½, you are generally required to start withdrawing money from a traditional 401(k) or IRA. Use this calculator to approximate your required minimum distribution based on your age and the value of your accounts.
Your 2011 required minimum distribution, or RMD, is based on the account balance(s) at the end of 2010, not 2011. RMDs from IRAs start in the year you turn 70Â½, although account owners were allowed to skip the RMD in the 2009 tax year. Your letter reads like you didn't take a required minimum distribution in the 2010 tax year. You wouldn't have this confusion about the 2011 distribution if you had taken a 2010 distribution.